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| Natura: | Artículo científico |
| Lingua: | es |
| Pubblicazione: |
Sociedade Brasileira de Física
2003
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| Accesso online: | https://www.redalyc.org/articulo.oa?id=46413573005 |
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Sommario:
- Numerical Study of Resistivity Scaling in Pi Junction Granular Superconductors Enzo Granato Física, Astronomía y Matemáticas Numerical simulations based on Monte Carlo dynamics are used to investigate the resistivity behavior of granular superconductors containing a random distribution of TT junctions, as in superconducting materials with d-wave symmetry. The presence of TT junctions leads to quenched in circulating currents (chiralities) and to chiral glass behavior at low temperatures, even without an external magnetic field. An XY spin glass model in the phase representation is used to determine the current-voltage characteristics and critical exponents of the resistivity transition. In two dimensions, the linear resistivity is nonzero at finite temperatures and the dynamic scaling analysis of the nonlinear resistivity is consistent with a phase transition at zero temperature. In three dimensions, we find a transition at finite temperatures below which the linear resistivity vanishes and the corresponding critical exponents are determined from the scaling analysis. The results are in good agreement with Langevin simulations in the phase representation. The dynamic exponent z is significantly different from previous results obtained in the vortex representation. 2003 artículo científico 0103-9733 https://www.redalyc.org/articulo.oa?id=46413573005 es http://www.redalyc.org/revista.oa?id=464 Brazilian Journal of Physics application/pdf Sociedade Brasileira de Física Brazilian Journal of Physics (Brasil) Num.4 Vol.33